Paper |
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MOPC105 |
Activities of Hitachi Relating to Construction of J-PARC Accelerator
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310 |
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- Y. Chida, S. Koseki
Hitachi Ltd., Ibaraki-ken
- M. Abe
Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken
- K. Nakamura, M. Watanabe, T. Watanabe, T. Watanuki
Hitachi. Ltd., Hitachi Works, Hitachi-shi
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The Japan Proton Accelerator Research Complex (J-PARC) consists of a 330-m-long linac, a 3-GeV rapid cycle synchrotron with a circumference of 350 m, and a 50-GeV synchrotron with a circumference of 1,570 m. Owing to a collaboration between the Japan Atomic Energy Agency (JAEA) and the High Energy Accelerator Research Organization (KEK), the accelerators will be commencing operations at the site of JAEA Tokai Research and Development Center. The beam commissioning of the entire accelerator system is planned to take place before the end of 2008. Along with the JAEA and KEK, Hitachi has contributed to the construction of the system by manufacturing some major equipment with specifications that are of the highest level in the world.
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WEPC138 |
Transient Electromagnetic Analysis and Thermal Design on the Magnet of 3-GeV Synchrotron
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2332 |
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- M. Abe, S. Tounos
Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken
- T. Adachi
KEK, Ibaraki
- Y. Chida
Hitachi Ltd., Ibaraki-ken
- K. Nakamura, T. Watanabe
Hitachi. Ltd., Hitachi Works, Hitachi-shi
- T. Takayanagi
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- N. Tani
JAEA/LINAC, Ibaraki-ken
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J-PARC 3GeV synchrotron is operated at 25Hz alternatively, which can generate eddy currents and heat. They can disturb continuous operations. We prepared a design technique to analyze them and manage the temperature rises of the magnets. Eddy current and hysteresis heat generations were calculated with 3D models then temperature rises were evaluated with natural convection cooling from surfaces. The technique was applied on the dipole, quadrupole and bump magnets. Slits on intense eddy current position can decrease the heat generation, however deep slits can disturb magnetic field distribution. Their depth and positions were optimized for the temperature rise reduction. So far, the synchrotron operation is fair with reasonable temperature rises.
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